how long have you__ fpr them?A been waited B waiting C been waiting D wait 答案是选D,为什么?

how long have you__ fpr them?A been waited B waiting C been waiting D wait 答案是选D,为什么? How long have you__?-Since 1990.A bought the MP3 B joined the Party C becomea midfield D lived in the room答案是D为啥不是B? How long have you been how long have you been learning english? How long have you been studying? How long will I have to How long ____you___(have)your car? How long have you been in China? known,how long,have they,each other How long have ;Tom and Mary -------[结婚] How long I have to wait how long have you been dancing today? how long have you studied in this How long have you been there? How long have you live in China How long have you ----(live)here? how long have they 还是用them how long have they 还是用them